Securing means.



T. J. LEWiS.

, SECURING MEANS. APPLICATION FILED SEPT-26,1916.

Patented Feb. 19, 1918 THOMAS JOHN LEWIS,

OF ARGOED, ENGLAND.

SECURING MEANS.

Specification of Letters Patent.

Patented Feb. Mi, 1918 Application filed September 26, 1916. Serial No.122,246.

T 0 all whom it may concern:

Be it known that I, THOMAS Jonx LEWIS, a subject of the King of England,residing at Argoed, in the county of lilomnouthshire, in England, haveinvented a new and useful Improvement in Securing Means, of which thefollowing is a specification.

This invention relates to stud'screws such as are used for adjustablysecuring the glands in piston-rod stutling-boxes, and for similarpurposes, my object being to save the work of having to drill out brokenstudscrews.

The invention comprises a plug-screw formed with an externallyscrew-threaded body-portiop, and a stud or pin having a nut working onthe free end thereof and formed with a fixed head at the inset end,

said plug-screw being slidably seated on the shank or plain portion ofthe stud and with the screw-threaded body portion in direct non-turnablecontact with the fixed head of the stud.

In order to fully explain my invention, I will describe the same withreference to the accompanying drawings which'show the invention appliedto the flange of a stuffing box Figure 1 isa sectional view of one formof construction; Fig. 2, 1s a cross-sectlon on line AA of Fig. 1; andFig. 3, 1s a front view of a modified construction.

The same letters of reference are used to denote the same or similarparts.

According to the constructional form shown in Figs. 1 and 2, I provide aplugserew a bored centrally with a square hole I) through which ispassed a slidable stud or pin 0, a portion 0 thereof being shaped tocorrespond with the hole 7) in the plug screw (1, the length of saidportion 0, not

exceeding the length of the full plug-screw 11.. The remaining portionof the Stud 0 is circular and threaded to receive a tightening up nntcl.

The hole in the plug-screw may, if preferred, be triangular or of anypolygonal form desired and the shank or neck of the stud or pin isthensimilarly shaped for a portion of its length corresponding to the lengthof the plugscrew so as to fit within the latter.

In the form shown in Fig. 3, I have simplified the previous arrangementby using a circular hole in the plug-screw a with a correspondinglysectioned stud or bolt. To prevent the stud from turning when theplug-screw u is screwed into position, I provide two small projectionsat the near side of the stud-head e fitting into recesses 7f in theplug'screw a, or vice verse.

The advantage hereis that the standard size plug-screws can be used forholding the studs fast in position.

In operation, and as applied for example to an oval piston-rodshifting-box two of these devices are made use of, the plug-screw o;with the studs therein being screwed into the stuffing-box flange, orcylinder plate or head, one at each side of the piston rod. Afterinserting the packin the gland is placed in position with the screwedouter or free ends of the studs 0 passed through bolt holes in the glandflange. The tightening nuts (I are then threaded on the screwed ends ofthe studs so that the gland is thus secured in position.

When the stud 01' pin 0 is broken, worn out or damaged. all that isnecessary is to unscrew the plug-screw u from the stuifing flange, orthe like and take out damaged stud c. It can then be replaced with a newone and a saving in time and labor is cffected as there are no brokenpins to be bored out or holes to be re-drilled.

I claim A stud-screw, a head to same, a shank extending from the head. aslidable but not turnable plug-scrcwon the shank adjacent said head, anda screw-threaded free-end portion in connection with the shank, as andfor the purpose stated. 7

THOMAS JOHN LEIVIS. \Vitnesscs:

iViLLIAn .T. PERKINS, FLORENCE H. LITTLE.

